Additional visual clarity is provided by the use of true low iron float glass in this high-performance double-glazed unit for solar control with thermal insulation. Solar control properties are combined with a low emissivity coating on surface #2 and the basic performance figures for this combination of 6 mm panes are:

U-value 1.1 W/m2K

G-value 0.45

Light transmission 73%

Figures for other pane configurations can be calculated using the free on-line tool Pilkington Spectrum: http://spectrum.pilkington.com